Plastic composition and method

Abstract

A plastic composition prepared by the reaction of a non-ionic water soluble acrylic polyelectrolyte and a cationic water soluble acrylic polyelectrolyte with propylene glycol and incorporating or conducting the reaction in the presence of polyvinyl pyrrolidone with or without water. In one embodiment a plastic composition adapted for use in contact with the skin, especially in the form of a pad, seal or bandage is prepared by reacting a mixture of: (1) acrylamide-beta methacrylyloxyethyl trimethyl ammonium sulfate copolymer; (2) polyacrylamide; (3) propylene glycol; and (4) polyvinyl pyrrolidone. The plastic composition can contain glycerin in varying amounts to enhance the "feel" and flexibility of the final product. Water can be incorporated with the polyvinyl pyrrolidone to reduce the gel time and facilitate the molding process. Useful embodiments of the composition having the proper gel structure and adhesiveness for use as molded seals or pads in ostomy appliances and skin-covering pads incorporated in a bandage are disclosed.

What is claimed is: 
     
       1. A process of making a plastic composition adapted for use in contact with the skin which comprises forming a mixture of a non-ionic water soluble polyacrylamide polyelectrolyte containing about 2% to 4% by weight of copolymerized sodium acrylate and a cationic water soluble polyelectrolyte acrylamide -beta methacrylyloxyethyltrimethylammonium methyl sulfate copolymer, and propylene glycol in an amount sufficient to form a gel. 
     
     
       2. A process as defined in claim 1 and wherein said copolymer contains about 10-40% by weight of beta methacrylyloxyethyltrimethylammonium methyl sulfate and the balance acrylamide. 
     
     
       3. A process as defined in claim 1 and wherein said propylene glycol is present in a weight proportion of about one part per part of said polymers. 
     
     
       4. A process as defined in claim 1 and wherein said copolymer contains about 14-23% by weight of beta methacrylyloxyethyltrimethylammonium methyl sulfate and the balance acrylamide, and said propylene glycol is present in a weight proportion of about one part per part of said polymers. 
     
     
       5. A process as defind in claim 1 and wherein said mixture contains about one part of glycerin per 1 to 4 parts of said polymers. 
     
     
       6. A process as defined in claim 1 and wherein said mixture contains about 1 part of polyvinyl pyrrolidone per 5 parts of said polymers. 
     
     
       7. A process as defined in claim 1 and wherein said polyacrylamide is present in a weight proportion of about 4 to 9 parts per part of said copolymer. 
     
     
       8. A process as defined in claim 7 and wherein said copolymer contains about 10-40% by weight of beta methacrylyloxyethyltrimethylammonium methyl sulfate and the balance acrylamide, and said propylene glycol is present in a weight proportion of about one part per part of said polymers. 
     
     
       9. A process as defined in claim 7 and wherein said copolymer contains about 14-23% by weight of beta methacrylyloxyethyltrimethylammonium methyl sulfate. 
     
     
       10. A plastic composition adapted for use in contact with the skin and produced by the process of claim 1. 
     
     
       11. A plastic composition adapted for use in contact with the skin and produced by the process of claim 7. 
     
     
       12. A pad adapted for application to the skin and formed of the composition of claim 10. 
     
     
       13. An annular sealing pad for an ostomy appliance formed of the composition of claim 10, having a central opening for inserting a surgical stoma therethrough, and being adapted to be disposed between the skin and an ostomy appliance to provide a seal therebetween. 
     
     
       14. A sealing pad as defined in claim 13 and having an annular disc-like body for disposition between the skin and the surface of an annular face plate in said appliance, and a rim integrally formed in one piece with said body around the inner periphery thereof and projecting outwardly therefrom through the face plate for disposition between the stoma and the face plate. 
     
     
       15. In a bandage for application to the skin, a pad formed of the composition of claim 10 arranged for contacting and covering an area of the skin. 
     
     
       16. A plastic composition formed by forming a mixture of: a cationic copolymer of acrylamide and beta methacrylyloxyethyltrimethylammonium methyl sulfate;   a non-ionic polymer of acrylamide;   glycerin;   propylene glycol; and   polyvinyl pyrrolidone;   the ratio of said cationic copolymer and said non-ionic polymer being about 1 to 9 to 1 to 1, and the total amounts of glycerin and propylene glycol being in excess of the total amounts of said cationic and non-ionic polymers.   
     
     
       17. A plastic composition in accordance with claim 16 in which: the ratio of the amounts of said cationic copolymer and said non-ionic polymer is about 1 to 9.   
     
     
       18. A plastic composition in accordance with claim 16 in which: the ratio of the amounts of said cationic copolymer and said non-ionic polymer is about 1 to 1.   
     
     
       19. A plastic composition in accordance with clain 16 containing a small amount of water. 
     
     
       20. A plastic composition in accordance with claim 19 in which about 2 to 8% by weight of water based on the total composition. 
     
     
       21. A plastic composition in accordance with claim 16 in which: said cationic copolymer of acrylamide is the copolymer of acrylamide and beta methacrylyloxyethyltrimethylammonium methyl sulfate containing about 10 to 40% by weight of said sulfate;   said non-ionic polymer of acrylamide is polyacrylamide containing about 2 to 4% by weight of copolymerized sodium acrylate.   
     
     
       22. A process of making a plastic composition in accordance with claim 1 in which about 7.0 to 9.0 parts of said nonionic water soluble polyacrylamide polyelectrolyte and about 1.0 to 3.0 parts of said cationic polyelectrolyte constituting a total of about 10 parts of said polyelectrolytes is mixed with about 10 to 11 parts of said propylene glycol, about 2 to 16 parts of glycerine and a small amount of water sufficient to facilitate gel formulation. 
     
     
       23. A process of making a plastic composition adapted for use in contact with the skin with comprises mixing an acrylic polyelectrolyte of the group consisting of nonionic water soluble polyacrylamide and a cationic water soluble acrylamide-beta methacrylyloxyethyltrimethylammonium methyl sulfate copolymer and mixtures thereof, with propylene glycol in an amount sufficient to form a gel. 
     
     
       24. A process in accordance with claim 23 in which about 1.0 to 5.0 parts of said nonionic water soluble polyacrylamide and about 5.0 to 9.0 parts of said cationic water soluble polyacrylamide is used, said mixture consisting a total of about 10 parts with at least about 10 parts of said propylene glycol. 
     
     
       25. A process in accordance with claim 24 in which said nonionic polyacrylamide contains about 2% to 4% by wt. of copolymerized sodium acrylate and said cationic polyacrylamide contains about 10to 40% by weight of said sulfate. 
     
     
       26. A process in accordance with claim 24 in which about 2.0 to 16 parts of glycerine per 10 parts of said mixture and a small amount of water are used.